pouzdano

1. (with know, say) for certain; for sure
   Ne znam pouzdano da li dolazi sutra. — I don't know for sure if he's coming tomorrow.
   Pouzdano se zna da je bio tamo. — It is known for certain that he was there.
2. reliably
   Ovaj auto radi pouzdano već deset godina. — This car has been running reliably for ten years.